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|
/**************************************************************************
*
* Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
#include <strings.h>
#include "glheader.h"
#include "macros.h"
#include "enums.h"
#include "texenvprogram.h"
#include "shader/program.h"
#include "shader/nvfragprog.h"
#include "shader/arbfragparse.h"
#define DISASSEM 0
/* Use uregs to represent registers internally, translate to Mesa's
* expected formats on emit.
*
* NOTE: These are passed by value extensively in this file rather
* than as usual by pointer reference. If this disturbs you, try
* remembering they are just 32bits in size.
*
* GCC is smart enough to deal with these dword-sized structures in
* much the same way as if I had defined them as dwords and was using
* macros to access and set the fields. This is much nicer and easier
* to evolve.
*/
struct ureg {
GLuint file:4;
GLuint idx:8;
GLuint negatebase:1;
GLuint abs:1;
GLuint negateabs:1;
GLuint swz:12;
GLuint pad:5;
};
const static struct ureg undef = {
~0,
~0,
0,
0,
0,
0,
0
};
#define X 0
#define Y 1
#define Z 2
#define W 3
/* State used to build the fragment program:
*/
struct texenv_fragment_program {
struct fragment_program *program;
GLcontext *ctx;
GLuint temp_flag; /* Tracks temporary regs which are in
* use.
*/
GLboolean error;
struct ureg src_texture; /* Reg containing sampled texture color,
* else undef.
*/
struct ureg src_previous; /* Reg containing color from previous
* stage. May need to be decl'd.
*/
GLuint last_tex_stage; /* Number of last enabled texture unit */
};
static struct ureg make_ureg(GLuint file, GLuint idx)
{
struct ureg reg;
reg.file = file;
reg.idx = idx;
reg.negatebase = 0;
reg.abs = 0;
reg.negateabs = 0;
reg.swz = SWIZZLE_NOOP;
reg.pad = 0;
return reg;
}
static struct ureg swizzle( struct ureg reg, int x, int y, int z, int w )
{
reg.swz = MAKE_SWIZZLE4(GET_SWZ(reg.swz, x),
GET_SWZ(reg.swz, y),
GET_SWZ(reg.swz, z),
GET_SWZ(reg.swz, w));
return reg;
}
static struct ureg swizzle1( struct ureg reg, int x )
{
return swizzle(reg, x, x, x, x);
}
static GLboolean is_undef( struct ureg reg )
{
return reg.file == 0xf;
}
static struct ureg get_temp( struct texenv_fragment_program *p )
{
int bit = ffs( ~p->temp_flag );
if (!bit) {
fprintf(stderr, "%s: out of temporaries\n", __FILE__);
exit(1);
}
p->temp_flag |= 1<<(bit-1);
return make_ureg(PROGRAM_TEMPORARY, (bit-1));
}
static void release_temps( struct texenv_fragment_program *p )
{
p->temp_flag = ~0x7;
}
static struct ureg register_param6( struct texenv_fragment_program *p,
GLint s0,
GLint s1,
GLint s2,
GLint s3,
GLint s4,
GLint s5)
{
GLint tokens[6];
GLuint idx;
tokens[0] = s0;
tokens[1] = s1;
tokens[2] = s2;
tokens[3] = s3;
tokens[4] = s4;
tokens[5] = s5;
idx = _mesa_add_state_reference( p->program->Parameters, tokens );
return make_ureg(PROGRAM_STATE_VAR, idx);
}
#define register_param1(p,s0) register_param6(p,s0,0,0,0,0,0)
#define register_param2(p,s0,s1) register_param6(p,s0,s1,0,0,0,0)
#define register_param3(p,s0,s1,s2) register_param6(p,s0,s1,s2,0,0,0)
#define register_param4(p,s0,s1,s2,s3) register_param6(p,s0,s1,s2,s3,0,0)
static struct ureg register_input( struct texenv_fragment_program *p, GLuint input )
{
p->program->InputsRead |= (1<<input);
return make_ureg(PROGRAM_INPUT, input);
}
static void emit_arg( struct fp_src_register *reg,
struct ureg ureg )
{
reg->File = ureg.file;
reg->Index = ureg.idx;
reg->Swizzle = ureg.swz;
reg->NegateBase = ureg.negatebase;
reg->Abs = ureg.abs;
reg->NegateAbs = ureg.negateabs;
}
static void emit_dst( struct fp_dst_register *dst,
struct ureg ureg, GLuint mask )
{
dst->File = ureg.file;
dst->Index = ureg.idx;
dst->WriteMask = mask;
dst->CondMask = 0;
dst->CondSwizzle = 0;
}
static struct fp_instruction *
emit_op(struct texenv_fragment_program *p,
GLuint op,
struct ureg dest,
GLuint mask,
GLuint saturate,
struct ureg src0,
struct ureg src1,
struct ureg src2 )
{
GLuint nr = p->program->Base.NumInstructions++;
struct fp_instruction *inst = &p->program->Instructions[nr];
memset(inst, 0, sizeof(*inst));
inst->Opcode = op;
emit_arg( &inst->SrcReg[0], src0 );
emit_arg( &inst->SrcReg[1], src1 );
emit_arg( &inst->SrcReg[2], src2 );
inst->Saturate = saturate;
emit_dst( &inst->DstReg, dest, mask );
return inst;
}
static struct ureg emit_arith( struct texenv_fragment_program *p,
GLuint op,
struct ureg dest,
GLuint mask,
GLuint saturate,
struct ureg src0,
struct ureg src1,
struct ureg src2 )
{
emit_op(p, op, dest, mask, saturate, src0, src1, src2);
p->program->NumAluInstructions++;
return dest;
}
static struct ureg emit_texld( struct texenv_fragment_program *p,
GLuint op,
struct ureg dest,
GLuint destmask,
GLuint tex_unit,
GLuint tex_idx,
struct ureg coord )
{
struct fp_instruction *inst = emit_op( p, op,
dest, destmask,
0, /* don't saturate? */
coord, /* arg 0? */
undef,
undef);
inst->TexSrcIdx = tex_idx;
inst->TexSrcUnit = tex_unit;
p->program->NumTexInstructions++;
if (coord.file != PROGRAM_INPUT &&
(coord.idx < FRAG_ATTRIB_TEX0 ||
coord.idx > FRAG_ATTRIB_TEX7)) {
p->program->NumTexIndirections++;
}
return dest;
}
static struct ureg register_const4f( struct texenv_fragment_program *p,
GLfloat s0,
GLfloat s1,
GLfloat s2,
GLfloat s3)
{
GLfloat values[4];
GLuint idx;
values[0] = s0;
values[1] = s1;
values[2] = s2;
values[3] = s3;
idx = _mesa_add_unnamed_constant( p->program->Parameters, values );
return make_ureg(PROGRAM_STATE_VAR, idx);
}
#define register_const1f(p, s0) register_const4f(p, s0, 0, 0, 1)
#define register_const2f(p, s0, s1) register_const4f(p, s0, s1, 0, 1)
#define register_const3f(p, s0, s1, s2) register_const4f(p, s0, s1, s2, 1)
static void program_error( struct texenv_fragment_program *p, const char *msg )
{
fprintf(stderr, "%s\n", msg);
p->error = 1;
}
static GLuint translate_tex_src_bit( struct texenv_fragment_program *p,
GLuint bit )
{
switch (bit) {
case TEXTURE_1D_BIT: return TEXTURE_1D_INDEX;
case TEXTURE_2D_BIT: return TEXTURE_2D_INDEX;
case TEXTURE_RECT_BIT: return TEXTURE_RECT_INDEX;
case TEXTURE_3D_BIT: return TEXTURE_3D_INDEX;
case TEXTURE_CUBE_BIT: return TEXTURE_CUBE_INDEX;
default: program_error(p, "TexSrcBit"); return 0;
}
}
static struct ureg get_source( struct texenv_fragment_program *p,
GLenum src, GLuint unit )
{
switch (src) {
case GL_TEXTURE:
if (is_undef(p->src_texture)) {
GLuint dim = translate_tex_src_bit( p, p->ctx->Texture.Unit[unit]._ReallyEnabled);
struct ureg texcoord = register_input(p, FRAG_ATTRIB_TEX0+unit);
struct ureg tmp = get_temp( p );
/* TODO: Use D0_MASK_XY where possible.
*/
p->src_texture = emit_texld( p, FP_OPCODE_TXP,
tmp, WRITEMASK_XYZW,
unit, dim, texcoord );
}
return p->src_texture;
/* Crossbar: */
case GL_TEXTURE0:
case GL_TEXTURE1:
case GL_TEXTURE2:
case GL_TEXTURE3:
case GL_TEXTURE4:
case GL_TEXTURE5:
case GL_TEXTURE6:
case GL_TEXTURE7: {
return undef;
}
case GL_CONSTANT:
return register_param2(p, STATE_TEXENV_COLOR, unit);
case GL_PRIMARY_COLOR:
return register_input(p, FRAG_ATTRIB_COL0);
case GL_PREVIOUS:
default:
if (is_undef(p->src_previous))
return register_input(p, FRAG_ATTRIB_COL0);
else
return p->src_previous;
}
}
static struct ureg emit_combine_source( struct texenv_fragment_program *p,
GLuint mask,
GLuint unit,
GLenum source,
GLenum operand )
{
struct ureg arg, src, one;
src = get_source(p, source, unit);
switch (operand) {
case GL_ONE_MINUS_SRC_COLOR:
/* Get unused tmp,
* Emit tmp = 1.0 - arg.xyzw
*/
arg = get_temp( p );
one = register_const1f(p, 1.0);
return emit_arith( p, FP_OPCODE_SUB, arg, mask, 0, one, src, undef);
case GL_SRC_ALPHA:
if (mask == WRITEMASK_W)
return src;
else
return swizzle1( src, W );
case GL_ONE_MINUS_SRC_ALPHA:
/* Get unused tmp,
* Emit tmp = 1.0 - arg.wwww
*/
arg = get_temp( p );
one = register_const1f(p, 1.0);
return emit_arith( p, FP_OPCODE_SUB, arg, mask, 0,
one, swizzle1(src, W), undef);
case GL_SRC_COLOR:
default:
return src;
}
}
static int nr_args( GLenum mode )
{
switch (mode) {
case GL_REPLACE: return 1;
case GL_MODULATE: return 2;
case GL_ADD: return 2;
case GL_ADD_SIGNED: return 2;
case GL_INTERPOLATE: return 3;
case GL_SUBTRACT: return 2;
case GL_DOT3_RGB_EXT: return 2;
case GL_DOT3_RGBA_EXT: return 2;
case GL_DOT3_RGB: return 2;
case GL_DOT3_RGBA: return 2;
default: return 0;
}
}
static GLboolean args_match( struct gl_texture_unit *texUnit )
{
int i, nr = nr_args(texUnit->_CurrentCombine->ModeRGB);
for (i = 0 ; i < nr ; i++) {
if (texUnit->_CurrentCombine->SourceA[i] != texUnit->_CurrentCombine->SourceRGB[i])
return GL_FALSE;
switch(texUnit->_CurrentCombine->OperandA[i]) {
case GL_SRC_ALPHA:
switch(texUnit->_CurrentCombine->OperandRGB[i]) {
case GL_SRC_COLOR:
case GL_SRC_ALPHA:
break;
default:
return GL_FALSE;
}
break;
case GL_ONE_MINUS_SRC_ALPHA:
switch(texUnit->_CurrentCombine->OperandRGB[i]) {
case GL_ONE_MINUS_SRC_COLOR:
case GL_ONE_MINUS_SRC_ALPHA:
break;
default:
return GL_FALSE;
}
break;
default:
return GL_FALSE; /* impossible */
}
}
return GL_TRUE;
}
static struct ureg emit_combine( struct texenv_fragment_program *p,
struct ureg dest,
GLuint mask,
GLuint saturate,
GLuint unit,
GLenum mode,
const GLenum *source,
const GLenum *operand)
{
int nr = nr_args(mode);
struct ureg src[3];
struct ureg tmp;
int i;
for (i = 0; i < nr; i++)
src[i] = emit_combine_source( p, mask, unit, source[i], operand[i] );
switch (mode) {
case GL_REPLACE:
if (mask == WRITEMASK_XYZW && !saturate)
return src[0];
else
return emit_arith( p, FP_OPCODE_MOV, dest, mask, saturate, src[0], undef, undef );
case GL_MODULATE:
return emit_arith( p, FP_OPCODE_MUL, dest, mask, saturate,
src[0], src[1], undef );
case GL_ADD:
return emit_arith( p, FP_OPCODE_ADD, dest, mask, saturate,
src[0], src[1], undef );
case GL_ADD_SIGNED:
/* tmp = arg0 + arg1
* result = tmp + -.5
*/
tmp = register_const1f(p, .5);
tmp = swizzle1(tmp,X);
emit_arith( p, FP_OPCODE_ADD, dest, mask, 0, src[0], src[1], undef );
emit_arith( p, FP_OPCODE_SUB, dest, mask, saturate, dest, tmp, undef );
return dest;
case GL_INTERPOLATE:
/* Arg0 * (Arg2) + Arg1 * (1-Arg2) -- note arguments are reordered:
*/
return emit_arith( p, FP_OPCODE_LRP, dest, mask, saturate, src[2], src[0], src[1] );
case GL_SUBTRACT:
return emit_arith( p, FP_OPCODE_SUB, dest, mask, saturate, src[0], src[1], undef );
case GL_DOT3_RGBA:
case GL_DOT3_RGBA_EXT:
case GL_DOT3_RGB_EXT:
case GL_DOT3_RGB: {
struct ureg tmp0 = get_temp( p );
struct ureg tmp1 = get_temp( p );
struct ureg neg1 = register_const1f(p, -1);
struct ureg two = register_const1f(p, 2);
/* tmp0 = 2*src0 - 1
* tmp1 = 2*src1 - 1
*
* dst = tmp0 dot3 tmp1
*/
emit_arith( p, FP_OPCODE_MAD, tmp0, WRITEMASK_XYZW, 0,
two, src[0], neg1);
if (memcmp(&src[0], &src[1], sizeof(struct ureg)) == 0)
tmp1 = tmp0;
else
emit_arith( p, FP_OPCODE_MAD, tmp1, WRITEMASK_XYZW, 0,
two, src[1], neg1);
emit_arith( p, FP_OPCODE_DP3, dest, mask, saturate, tmp0, tmp1, undef);
return dest;
}
default:
return src[0];
}
}
static struct ureg get_dest( struct texenv_fragment_program *p, int unit )
{
if (p->ctx->_TriangleCaps & DD_SEPARATE_SPECULAR)
return get_temp( p );
else if (unit != p->last_tex_stage)
return get_temp( p );
else
return make_ureg(PROGRAM_OUTPUT, FRAG_OUTPUT_COLR);
}
static struct ureg emit_texenv( struct texenv_fragment_program *p, int unit )
{
struct gl_texture_unit *texUnit = &p->ctx->Texture.Unit[unit];
GLuint saturate = (unit < p->last_tex_stage);
GLuint rgb_shift, alpha_shift;
struct ureg out, shift;
struct ureg dest = get_dest(p, unit);
if (!texUnit->_ReallyEnabled) {
return get_source(p, GL_PREVIOUS, 0);
}
switch (texUnit->_CurrentCombine->ModeRGB) {
case GL_DOT3_RGB_EXT:
alpha_shift = texUnit->_CurrentCombine->ScaleShiftA;
rgb_shift = 0;
break;
case GL_DOT3_RGBA_EXT:
alpha_shift = 0;
rgb_shift = 0;
break;
default:
rgb_shift = texUnit->_CurrentCombine->ScaleShiftRGB;
alpha_shift = texUnit->_CurrentCombine->ScaleShiftA;
break;
}
/* Emit the RGB and A combine ops
*/
if (texUnit->_CurrentCombine->ModeRGB == texUnit->_CurrentCombine->ModeA &&
args_match( texUnit )) {
out = emit_combine( p, dest, WRITEMASK_XYZW, saturate,
unit,
texUnit->_CurrentCombine->ModeRGB,
texUnit->_CurrentCombine->SourceRGB,
texUnit->_CurrentCombine->OperandRGB );
}
else if (texUnit->_CurrentCombine->ModeRGB == GL_DOT3_RGBA_EXT ||
texUnit->_CurrentCombine->ModeRGB == GL_DOT3_RGBA) {
out = emit_combine( p, dest, WRITEMASK_XYZW, saturate,
unit,
texUnit->_CurrentCombine->ModeRGB,
texUnit->_CurrentCombine->SourceRGB,
texUnit->_CurrentCombine->OperandRGB );
}
else {
/* Need to do something to stop from re-emitting identical
* argument calculations here:
*/
out = emit_combine( p, dest, WRITEMASK_XYZ, saturate,
unit,
texUnit->_CurrentCombine->ModeRGB,
texUnit->_CurrentCombine->SourceRGB,
texUnit->_CurrentCombine->OperandRGB );
out = emit_combine( p, dest, WRITEMASK_W, saturate,
unit,
texUnit->_CurrentCombine->ModeA,
texUnit->_CurrentCombine->SourceA,
texUnit->_CurrentCombine->OperandA );
}
/* Deal with the final shift:
*/
if (alpha_shift || rgb_shift) {
if (rgb_shift == alpha_shift) {
shift = register_const1f(p, 1<<rgb_shift);
shift = swizzle1(shift,X);
}
else {
shift = register_const2f(p, 1<<rgb_shift, 1<<alpha_shift);
shift = swizzle(shift,X,X,X,Y);
}
return emit_arith( p, FP_OPCODE_MUL, dest, WRITEMASK_XYZW,
saturate, out, shift, undef );
}
else
return out;
}
void _mesa_UpdateTexEnvProgram( GLcontext *ctx )
{
struct texenv_fragment_program p;
GLuint unit;
struct ureg cf, out;
if (ctx->FragmentProgram._Enabled)
return;
p.ctx = ctx;
p.program = &ctx->_TexEnvProgram;
if (p.program->Instructions == NULL) {
p.program->Instructions = MALLOC(sizeof(struct fp_instruction) * 100);
}
p.program->Base.NumInstructions = 0;
p.program->NumTexIndirections = 1; /* correct? */
p.program->NumTexInstructions = 0;
p.program->NumAluInstructions = 0;
p.src_texture = undef;
p.src_previous = undef;
p.last_tex_stage = 0;
if (ctx->Texture._EnabledUnits) {
for (unit = 0 ; unit < ctx->Const.MaxTextureUnits ; unit++)
if (ctx->Texture.Unit[unit]._ReallyEnabled) {
p.last_tex_stage = unit;
}
for (unit = 0 ; unit < ctx->Const.MaxTextureUnits; unit++)
if (ctx->Texture.Unit[unit]._ReallyEnabled) {
p.src_previous = emit_texenv( &p, unit );
p.src_texture = undef;
p.temp_flag = 0xffff000;
p.temp_flag |= 1 << p.src_previous.idx;
}
}
cf = get_source( &p, GL_PREVIOUS, 0 );
out = make_ureg( PROGRAM_OUTPUT, FRAG_OUTPUT_COLR );
if (ctx->_TriangleCaps & DD_SEPARATE_SPECULAR) {
/* Emit specular add.
*/
struct ureg s = register_input(&p, FRAG_ATTRIB_COL1);
emit_arith( &p, FP_OPCODE_ADD, out, WRITEMASK_XYZ, 0, cf, s, undef );
}
else if (memcmp(&cf, &out, sizeof(cf)) != 0) {
/* Will wind up in here if no texture enabled or a couple of
* other scenarios (GL_REPLACE for instance).
*/
emit_arith( &p, FP_OPCODE_MOV, out, WRITEMASK_XYZW, 0, cf, undef, undef );
}
/* Finish up:
*/
emit_arith( &p, FP_OPCODE_END, undef, WRITEMASK_XYZW, 0, undef, undef, undef);
if (p.program->NumTexIndirections > ctx->Const.MaxFragmentProgramTexIndirections)
program_error(&p, "Exceeded max nr indirect texture lookups");
if (p.program->NumTexInstructions > ctx->Const.MaxFragmentProgramTexInstructions)
program_error(&p, "Exceeded max TEX instructions");
if (p.program->NumAluInstructions > ctx->Const.MaxFragmentProgramAluInstructions)
program_error(&p, "Exceeded max ALU instructions");
#if DISASSEM
_mesa_debug_fp_inst(p.program->NumTexInstructions + p.program->NumAluInstructions,
p.program->Instructions);
_mesa_printf("\n");
#endif
}
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